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hey guys i took my car in yesterday for emissions and it passed on everything but nox? something nitrogen or something...well anyways i was wondering if u guys maybe would have a thought at wwhat would be wrong?..the nox level was too high.. it was supposed to be at 2 and mine was at 3.1

thanks
chris
 

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1968 Cadillac Sedan deVille, 1994 Chevrolet G20
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Check to make sure your EGR valve works. Yours may be stuck shut, or the passages leading to it clogged.
 
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